could be several things. What makes you think it's vacuum related? Did something occur to make you think so? It could certainly be vacuum related. I would check over all of your vacuum hoses and connections along with all of the intake ducting. As mentioned, I would also try cleaing your Idle air control valve. While it is idling and doing the surging, try tapping on the IAC with the handle of a good sized screwdriver. Sometimes those guys will stick and after a couple whacks, they will settle down. There is always a chance you could have an ECU problem and there could be other issues. Go with the easiest and obvious first.
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